Rockwell Automation 1771-OAD User Manual

Installation Instructions

AC (12Ć120V) Output Module

Cat. No. 1771ĆOAD Series C

To The Installer

Important User Information

This document provides information on:

To See page

Important User Information 1 Important PreĆinstallation Considerations 4 Calculate Power Requirements 5 Select the Mode of the FuseĆblown Jumper 5

Key the Backplane Connector 7

Install the Module and Field Wiring Arm 8

Connect Wiring to the Output Module 9

Troubleshooting 11

For this reference information See page

Interpreting the Status Indicators 11 Replacing the Fuse 12 Hazardous Locations 13 Specifications 14

Because of the variety of uses for the products described in this publication, those responsible for the application and use of these products must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards. In no event will Rockwell Automation be responsible or liable for indirect or consequential damage resulting from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples shown in this publication are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Rockwell Automation does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

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AC (12-120V) Output Module2

Allen–Bradley publication SGI–1.1, Safety Guidelines for Application, Installation, and Maintenance of Solid–State Control (available from your local Rockwell Automation office), describes some important differences between solid–state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or part, without written permission of Rockwell Automation, is prohibited.

Throughout this publication, notes may be used to make you aware of safety considerations. The following annotations and their accompanying statements help you to identify a potential hazard, avoid a potential hazard, and recognize the consequences of a potential hazard.

WARNING

ATTENTION

IMPORTAN

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

Identifies information about practices or circumstances that may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for successful application and understanding of the product.

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AC (12-120V) Output Module 3

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664–1), at altitudes up to 2000 meters without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as “open type” equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present, and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosures. Also, see the appropriate sections in this publication, as well as the Allen–Bradley publication 1770–4.1, (“Industrial Automation Wiring and Grounding Guidelines”), for additional installation requirements pertaining to this equipment.

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AC (12-120V) Output Module4

PreĆinstallation Considerations

ATTENTION

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packaging.

The 1771-OAD Series C module is compatible with all chassis except 1771-A1, 1771-A2 and 1771-A4 chassis. Make sure no other output module or single card block transfer module is placed in the same module group when using 2-slot addressing. Any discrete input module may be used within the same module group.

Using the 1771ĆOAD Series C Module with HalfĆwave Rectifying Load Devices (single diode) and Indicator Lights

This module uses zero-crossing technology to allow turn-on when the output voltage is less than a specified voltage (typically 40 to 50V). This greatly reduces the stress on contacts and other devices that are sensitive to current surges.

• When using this output module with a device that includes a

single diode in series with the load, place a shunt resistor (39K ohm, 1W) across the load. This resistor allows proper output operation.

The shunt resistor may cause LED indicators to glow when the output is turned off. In this case, use an incandescent lamp in place of the LED.

• When using a full-wave rectified device, the device may not turn

off when the output is deenergized. Add a 2.5K ohm, 10W resistor in parallel with the device to provide proper operation.

• If 24V ac incandescent indicator lights appear dim when used

with the Series C module, place a 2.5K ohm, 10W resistor in parallel with the indicator. This will restore full brightness.

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AC (12-120V) Output Module 5

Simplified Circuit Diagram

Control

1. When L2 is positive with respect to

L1, capacitor C1 is charged.

2. When the polarity switches, the diode

prevents C1 from discharging.

3. With C1 charged (possibly up to line

voltage), the zeroĆcrossing optoĆtriac sees that voltage, and won't turn on.

4. The shunt resistor allows a bleedĆoff of

the voltage on the capacitor, allowing the circuit to function properly.

ZeroĆCrossing OptoĆisolation

Calculate Power Requirements

39KΩ

Load

Single rectifying diode

in series with load. Shunt Resistor required

No rectifying diode.

Shunt Resistor NOT required

Full wave rectifier.

Shunt Resistor NOT required

Note: A resistor may be required if the load is less than 50mA.

Your module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The module requires 295mA from the output of this supply. Add this to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or chassis power supply.

Select the Mode of the Fuse-Blown Jumper

The fuse-blown jumper has two modes:

• the preset, standard (STD) mode – displays the fuse status on

the red fuse-blown status indicator

• the customer side indication (CSI) mode – displays the fuse

status in the input image table and on the red fuse-blown status indicator.

This mode configures the module as a 16 point output module that uses both the output and input image data tables of your controller. When a fuse blows, all 16 bits in the associated input image table will turn on (1).

For example, if you install the module in a PLC-5 system and address the module as O:012, then the fuse status bits are in I:012.

To monitor the status of the module fuse, make certain that your user program monitors the module’s input image table for ‘‘on” bits.

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